diff --git a/pyproject.toml b/pyproject.toml
index 2b161795..737ff6f0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -41,9 +41,9 @@ langgraph = [
     "langgraph-checkpoint>=3.0.0, <3.1.0"
 ]
 test = [
-    "black[jupyter]==25.9.0",
+    "black[jupyter]==25.12.0",
     "isort==7.0.0",
-    "mypy==1.18.2",
+    "mypy==1.19.1",
     "pytest-asyncio==0.26.0",
     "pytest==8.4.2",
     "pytest-cov==7.0.0",
diff --git a/requirements.txt b/requirements.txt
index bacbe361..feb341ca 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
-cloud-sql-python-connector[asyncpg]==1.18.5
-numpy==2.3.3; python_version >= "3.11"
+cloud-sql-python-connector[asyncpg]==1.19.0
+numpy==2.3.5; python_version >= "3.11"
 numpy==2.2.6; python_version == "3.10"
 langgraph==1.0.4
 langchain-postgres==0.0.16
diff --git a/samples/langchain_on_vertexai/prebuilt_langchain_agent_template.py b/samples/langchain_on_vertexai/prebuilt_langchain_agent_template.py
index 9e492783..efd7fb58 100644
--- a/samples/langchain_on_vertexai/prebuilt_langchain_agent_template.py
+++ b/samples/langchain_on_vertexai/prebuilt_langchain_agent_template.py
@@ -91,9 +91,9 @@ def similarity_search(query: str) -> list[Document]:
 DISPLAY_NAME = os.getenv("DISPLAY_NAME") or "PrebuiltAgent"
 
 remote_app = reasoning_engines.ReasoningEngine.create(
-    reasoning_engines.LangchainAgent(
+    reasoning_engines.LangchainAgent(  # type: ignore[arg-type]
         model="gemini-2.0-flash-001",
-        tools=[similarity_search],
+        tools=[similarity_search],  # type: ignore[list-item]
         model_kwargs={
             "temperature": 0.1,
         },
@@ -104,4 +104,4 @@ def similarity_search(query: str) -> list[Document]:
     extra_packages=["config.py"],
 )
 
-print(remote_app.query(input="movies about engineers"))
+print(remote_app.query(input="movies about engineers"))  # type: ignore[attr-defined]
diff --git a/samples/langchain_on_vertexai/retriever_agent_with_history_template.py b/samples/langchain_on_vertexai/retriever_agent_with_history_template.py
index 2867d041..bba06a16 100644
--- a/samples/langchain_on_vertexai/retriever_agent_with_history_template.py
+++ b/samples/langchain_on_vertexai/retriever_agent_with_history_template.py
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 import os
-from typing import Optional
+from typing import Any, Optional
 
 import vertexai  # type: ignore
 from config import (
@@ -132,7 +132,7 @@ def set_up(self):
             history_messages_key="chat_history",
         )
 
-    def query(self, input: str, session_id: str) -> str:
+    def query(self, input: str, session_id: str, **kwargs: Any) -> str:  # type: ignore[override]
         """Query the application.
 
         Args:
@@ -192,4 +192,4 @@ def query(self, input: str, session_id: str) -> str:
     extra_packages=["config.py"],
 )
 
-print(remote_app.query(input="movies about engineers", session_id="abc123"))
+print(remote_app.query(input="movies about engineers", session_id="abc123"))  # type: ignore
diff --git a/samples/langchain_on_vertexai/retriever_chain_template.py b/samples/langchain_on_vertexai/retriever_chain_template.py
index 8abfbb21..0d322ba8 100644
--- a/samples/langchain_on_vertexai/retriever_chain_template.py
+++ b/samples/langchain_on_vertexai/retriever_chain_template.py
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 import os
-from typing import Optional
+from typing import Any, Optional
 
 import vertexai  # type: ignore
 from config import (
@@ -106,7 +106,7 @@ def set_up(self):
         # an LLM to generate a response
         self.chain = create_retrieval_chain(retriever, combine_docs_chain)
 
-    def query(self, input: str) -> str:
+    def query(self, input: str, **kwargs: Any) -> str:  # type: ignore[override]
         """Query the application.
 
         Args:
@@ -161,4 +161,4 @@ def query(self, input: str) -> str:
     extra_packages=["config.py"],
 )
 
-print(remote_app.query(input="movies about engineers"))
+print(remote_app.query(input="movies about engineers"))  # type: ignore
diff --git a/samples/requirements.txt b/samples/requirements.txt
index b6b27ad1..fa739a07 100644
--- a/samples/requirements.txt
+++ b/samples/requirements.txt
@@ -1,5 +1,5 @@
-google-cloud-aiplatform[reasoningengine,langchain]==1.97.0
-google-cloud-resource-manager==1.14.2
+google-cloud-aiplatform[reasoningengine,langchain]==1.130.0
+google-cloud-resource-manager==1.15.0
 langchain-community==0.3.29
 langchain-google-cloud-sql-pg==0.14.1
-langchain-google-vertexai==2.0.27
+langchain-google-vertexai==2.1.2